Detective John Luther (Idris Elba of PROMETHEUS), who, at the end of season three, seemingly abandoned his job and ran off with psychotic killer Alice Morgan. Now, it's a few months later and Alice has disappeared. She had stolen some diamonds and was trying to sell them so she and Luther could move away, out of the country, and live ‘happily ever after." Soon, his old colleagues contact him and inform him that Alice is dead. Who killed her and why? At the same time, there's a vicious serial killer cannibal who is going on a rampage. Luther can't help but try to stop him so he rejoins the force, with a new partner, DS Emma Lane (Rose Leslie of GAME OF THRONES). Her former partner was killed by the cannibal.

Although we primarily see the aftermath of the bloodbaths, this is an intense, gory season. Definitely recommended to horror fans.